1987

7.8

2011

7.5

2015

7.6

1991

7.6

1978

7.2

1979

6.8

2007

6.8

2017

6.8

2012

7.4

2024

7.6

2023

6.6

2015

6.9

1992

7.2

1990

8.0

1993

7.0

1973

7.6

2006

8.6

1993

7.1

2011

8.3

2020

7.5